Add rules.mk for authmgr-be crate

Test: N/A
Bug: 369145005
Change-Id: Ib2c03702589e02287be3b25eb4cdafe34e933a2c

lib/authmgr-be-rust/rules.mk

diff --git a/lib/authmgr-be-rust/rules.mk b/lib/authmgr-be-rust/rules.mk
new file mode 100644
index 0000000..67235c1
--- /dev/null
+++ b/lib/authmgr-be-rust/rules.mk
@@ -0,0 +1,30 @@
+# Copyright (C) 2025 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS := system/see/authmgr/authmgr-be/src/lib.rs
+
+MODULE_CRATE_NAME := authmgr_be
+
+MODULE_LIBRARY_EXPORTED_DEPS += \
+	trusty/user/base/lib/authgraph-rust/core \
+	trusty/user/base/lib/authmgr-common-rust \
+	$(call FIND_CRATE,coset) \
+	$(call FIND_CRATE,log) \
+
+include make/library.mk